Effect of Na2SiO3/NaOH on mechanical properties and microstructure of geopolymer mortar using fly ash and rice husk ash as precursor

2019 ◽

Vol 798 ◽

pp. 364-369 ◽

Cited By ~ 2

Author(s):

Khemmakorn Gomonsirisuk ◽

Parjaree Thavorniti

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Rice Husk ◽

Ball Mill ◽

Water Glass ◽

Rice Husk Ash ◽

Raw Materials ◽

Agricultural Waste ◽

Preparation Process

The aim of this work is to study the feasibility of preparation of fly ash based geopolymer using sodium water glass from agricultural waste as alternative activators. Rice husk ash and bagasse ash were used as raw materials for producing sodium water glass solution. The sodium water glass were produced by mixing rice husk ash and bagasse ash with NaOH in ball mill and boiling. The prepared sodium water glass were analyzed and used in geopolymer preparation process. The geopolymer paste were prepared by adding the obtained water glass and NaOH with fly ash. After cured at ambient temperature for 7 days, mechanical properties were investigated. Bonding and phases of the geopolymer were also characterized. The geopolymer from rice husk ash presented highest compressive strength about 23 MPa while the greatest for bagasse ash was about 16 MPa.

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Influence of rice husk ash on mechanical properties and fire resistance of recycled aggregate high-calcium fly ash geopolymer concrete

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.119797 ◽

2020 ◽

Vol 252 ◽

pp. 119797 ◽

Cited By ~ 8

Author(s):

Peem Nuaklong ◽

Pitcha Jongvivatsakul ◽

Thanyawat Pothisiri ◽

Vanchai Sata ◽

Prinya Chindaprasirt

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Rice Husk ◽

Fire Resistance ◽

Rice Husk Ash ◽

Recycled Aggregate ◽

Geopolymer Concrete ◽

High Calcium ◽

High Calcium Fly Ash

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Effective Utilization of Industrial and Agricultural Waste for Developing Sustainable Self-Compacting Concrete

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1048.376 ◽

2022 ◽

Vol 1048 ◽

pp. 376-386

Author(s):

M.S. Riyana ◽

Dhanya Sathyan ◽

M.K. Haridharan

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Portland Cement ◽

Rice Husk ◽

Ordinary Portland Cement ◽

Rice Husk Ash ◽

Cement Content ◽

Supplementary Cementitious Materials ◽

Ternary Blend ◽

Self Compacting Concrete

SCC (Self compacting concrete) can fill formwork and encloses reinforcing bars under gravity and maintains homogeneity without vibration. SCC shortens the period of construction, guarantees compaction in confined zones, moreover terminates noise due to vibration. The wide spread application of SCC is restricted because of the high cost for the production of SCC with high cement content and chemical admixtures. In order to make the production of SCC economical, and to reduce the high cement content the Ordinary Portland Cement in SCC can be blended with pozzolanic materials like rice husk ash and supplementary cementitious materials like fly ash. In this paper the fresh state properties and mechanical properties such as compressive strength, split tensile strength and flexural strength of SCC with ternary blends of rice husk ash (RHA) and fly ash (FA) were studied. For this purpose, different mixes were prepared by replacing Ordinary Portland Cement (OPC) with 5%, 10%, 15% and 20% of rice husk ash (RHA) and the percentage of addition of fly ash (FA) is fixed as 15% for all these mixes. It was observed that the specimen incorporating 10% of rice husk ash (RHA) and 15% of fly ash (FA) as ternary blend exhibits better mechanical properties such as: Compressive, split tensile and flexural strengths at 28 days of age as compared to traditional mix of SCC without RHA (Rice Husk Ash) and FA (Fly Ash). This research demonstrates that the ideal percentage for a mixture of rice husk ash (RHA) and fly ash as ternary blend is 10% and 15% respectively.

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Mechanical Properties of Fibre Reinforced Self Compacting Concrete using Rice Husk Ash

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c5665.098319 ◽

2019 ◽

Vol 8 (3) ◽

pp. 6412-6415 ◽

Cited By ~ 4

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Rice Husk ◽

Mechanical Characteristics ◽

Rice Husk Ash ◽

Fresh Concrete ◽

Steel Fibers ◽

Self Compacting Concrete ◽

Flow Through ◽

Water Curing

Self-compacting concrete (SCC) is relatively a recent development in the construction world. SCC can flow through dense reinforcement under its own weight without any segregation, bleeding, and vibration. The use of steel fibers is being encouraged to increase mechanical characteristics of SSC. However, adding fibers to fresh concrete results in loss of workability. Steel fibers operate as crack arrestors in concrete and extend the span of structures. In the present study, the mechanical properties of SCC with cement is partially replaced by rice husk ash (RHA) & P500 (ultra-fine fly ash). A total of 5 mixes with 0.3 W/C ratio were cast for 7, 28 and 56 days water curing. The replacement of fibres is considered as 0%, 0.5%, 1%, 1.5%, and 2% by weight of cement. Workability, Compressive, Split Tensile and Flexural strength is studied in this investigation. Superior strength was observed at optimum dosage of steel fibers at 1.5% by weight of cement

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Efficiency of rice husk ash and fly ash as reactivity materials in sustainable concrete

Sustainable Environment Research ◽

10.1186/s42834-019-0035-2 ◽

2019 ◽

Vol 29 (1) ◽

Cited By ~ 2

Author(s):

Mohamed Amin ◽

Bassam Abdelsalam Abdelsalam

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Physical Properties ◽

Rice Husk ◽

Water Permeability ◽

Rice Husk Ash ◽

Experimental Program ◽

Hardened Concrete ◽

Concrete Mixtures

AbstractMany environmental problems occur due to rice husk burning and emissions from coal-fired power stations. This paper presents the recycling of rice husk ash (RHA) and fly ash (FA) from power plants as reactivity materials for producing sustainable (green) concrete. This research aims to investigate the efficiency of RHA and FA replacement ratios on fresh and hardened properties of concrete mixtures. The experimental program consisted of 21 concrete mixtures, which were divided into three groups. The cementitious material contents were 350, 450 and 550 kg m−3 for groups one, two and three, respectively. The replacement ratios from the cement content were 10, 20 and 30% respectively, for each recycle material (RHA and FA). The slump and air contents of fresh concrete were measured. The compressive strength, splitting tensile strength, flexural strength, modulus of elasticity and bond strength of hardened concrete as mechanical properties were also analyzed. The compressive strength was monitored at different ages: 3, 7, 28, 60 and 90 d. The water permeability test of hardened concrete as physical properties was conducted. Test results showed that the RHA and FA enhanced the mechanical and physical properties compared with the control mixture. The cementitious content of 450 kg m−3 exhibited better results than other utilized contents. In particular, the replacement ratios of 10 and 30% of RHA presented higher mechanical properties than those of FA for each group. The water permeability decreased as the cementitious content increased due to the decrease in air content for all mixtures. The water permeability loss ratios increased as the cementitious content decreased.

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Performance of Mortar Grouts Incorporating Rice Husk Ash and Fly Ash

Recycled Waste Materials in Concrete Construction - Advances in Civil and Industrial Engineering ◽

10.4018/978-1-5225-8325-7.ch003 ◽

2019 ◽

pp. 31-48

Keyword(s):

Mechanical Properties ◽

Compressive Strength ◽

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

Apparent Volume ◽

Partial Replacement ◽

Hardened State ◽

Strength And Durability ◽

Penetration Tests

Chapter 3 is based on performance of mortar grouts incorporating rice husk ash (RHA) and fly ash (FA). Detailed experimental work was conducted to investigate the mechanical properties of mortar grout using RHA and FA as partial replacement of cement. This study investigated the compressive strength and durability of mortar grouts in their hardened state. Durability tests such as water absorption, apparent volume of permeable voids, sorptivity, and rapid chloride penetration tests are researched. Detailed results and discussion which focused on mechanical properties as well as durability of hardened state mortar grout are presented. It was confirmed that the inclusion of blended RHA and FA significantly improved the compressive strength of mortar grouts. The durability of mortar grout increased along with a longer curing time. Hence, RHA and FA can partially replace cement in the production of mortar grouts.

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